check_domain.sh

#!/usr/bin/env bash

set -euo pipefail

FILE="${1:-domains.txt}"

if [[ ! -f "$FILE" ]]; then
  echo "Domain list file not found: $FILE"
  exit 1
fi

printf "%-35s %-12s %-10s %-10s\n" "DOMAIN" "DNS" "HTTP" "HTTPS"
printf "%-35s %-12s %-10s %-10s\n" "------" "---" "----" "-----"

while read -r domain; do
  [[ -z "$domain" || "$domain" =~ ^# ]] && continue

  # DNS check
  dns=$(dig +short "$domain" A "$domain" CNAME | head -n1)
  if [[ -z "$dns" ]]; then
    dns_status="NO_DNS"
  else
    dns_status="OK"
  fi

  # HTTP check
  if curl -sI --max-time 5 "http://$domain" >/dev/null; then
    http_status="OK"
  else
    http_status="FAIL"
  fi

  # HTTPS check
  if curl -sI --max-time 5 "https://$domain" >/dev/null; then
    https_status="OK"
  else
    https_status="FAIL"
  fi

  printf "%-35s %-12s %-10s %-10s\n" \
    "$domain" "$dns_status" "$http_status" "$https_status"

done < "$FILE"